In this exerciese we will deploy a function that has some external library dependencies and see how Kubeless handles dependencies.
Kubeless has support for a number of different programming lanaguages and their prefered package managers:
| Language | Package manger | Package file |
|---|---|---|
| Java | Maven | pom.xml |
| Node.js | npm | package.json |
| Python | pip | requirements.txt |
| Ruby | gem | Gemfile |
| Go | dep | Gopkg.toml |
| .Net Core | NuGet | .csproj |
You can use kubelctl get pods -w in a seperate terminal window in order to
"see" how dependencies are installed using the init contianer method. Do this
before running any kubless function deploy.
In this exercise we are going to deploy a simple function that uses query.yahooapis.com to retrieve the weather forcast for a specific location.
Deploy the function using the kubeless function deploy command with the
following parameter:
- name: weather
- runtime: nodejs8
- file: index.js
- dependencies: package.json
- handler: index.weather
Use kubeless function deploy -h to get the name of the command line options.
You can view a functions dependencies by lising all functions using kubless function list or by inspecting the function using kubeless function describe <name> where <name> is the name of the function you have deployed.
- Using the
kubelessCLI what are the dependencies of this function?
Now that the function has been deployed you can invoke the weather function by
using the kubeless function call command.
This function expect a data input of the following format:
{"location": "<location>"}Example:
{"location": "Oslo, Norway"}
Use kubeless function call --help if you are usure about the arguments
required to invoke functions.
- What is the weather forcast for
Bergen, Norway? - What is the weather forcast for
Trollvik, Troms Fylke, Norway?
When you are done you can exit your open shells and run the following command:
$ kubeless function delete weather